/Engine/Source/Runtime/MovieScene/Public/MovieScene.h
These objects are stored as "inners" of the MovieScene.
Guid of the newly-added spawnable.
[FGuid](API\Runtime\Core\Misc\FGuid) AddSpawnable ( const [FString](API\Runtime\Core\Containers\FString) & Name, [UObject](API\Runtime\CoreUObject\UObject\UObject) & ObjectTemplate )